Clearly mark the selected request action in "Select action" dropdown

The contrast is much better now, it passes the accessibility checks.
This is also consistent with how we display selected items/elements
throughout the application, like the notification filters.

src/api/app/views/webui/request/_action_text.html.haml

@@ -4,7 +4,7 @@
     %p.mt-0.mb-0.fw-normal
       %span.me-2 ##{action_index + 1}
       = details['comment'].truncate(50)
-    %p.mb-0.mt-0.text-muted.fw-light.small
+    %p.mb-0.mt-0.small
       = action.name
   - else
     %p.mt-0.mb-0.fw-normal
@@ -18,14 +18,14 @@
     = action.name
 -# add_role, delete and set_bugowner are actions on the target repo, so they don't need to mention where they are coming from
 - unless %w[add_role delete set_bugowner].include?(action.type)
-  %p.mb-0.mt-0.text-muted.fw-light.small
+  %p.mb-0.mt-0.small
     from
     = action.source_project
     - if action.source_package
       \/
       = action.source_package
 - if details
-  %p.mb-0.mt-0.text-muted.fw-light.small
+  %p.mb-0.mt-0.small
     by
     = details['user']
     #{ApplicationController.helpers.time_ago_in_words(details['time'].to_i)} ago

src/api/app/views/webui/request/_actions_details.html.haml

@@ -15,14 +15,14 @@
             %span Action
             %span.float-end Revision
         - submit_actions.each_with_index do |action_item, action_index|
-          %li
-            %hr.dropdown-divider
+          %li.border-top
             = link_to((render partial: 'action_text', locals: { action: action_item, action_index: action_index }),
                                                       request_show_path(number: bs_request.number,
                                                                         request_action_id: action_item.id,
                                                                         full_diff: diff_limit,
                                                                         diff_to_superseded: diff_to_superseded_id),
-                                                      class: "dropdown-item #{action_item.id == active_action.id ? 'disabled' : ''}")
+                                                      class: "dropdown-item #{action_item.id == active_action.id ? 'active' : ''}",
+                                                      'aria-current': 'true')
 %p
   - if submit_actions_count > 1
     - active_action_index = submit_actions.find_index(active_action) + 1